1 需求

我现在有一个300MB 的文件，想要根据这个文件，创建100万个大小一样的，名称不一样，如何实现，如何比较快点实现

2 实现

1 先准备好这个文件

2 准备好目录

3 写代码

private static void createFile(String sourceFilePath,String destinationFolderPath, int fileNumber) {File file1 = new File(sourceFilePath);Path sourcePath = Paths.get(sourceFilePath);String destinationFileName = "copy_" + UUID.randomUUID().toString() + "_" + file1.getName();Path destinationPath = Paths.get(destinationFolderPath, destinationFileName);//try {// 复制源文件到目标文件Files.copy(sourcePath, destinationPath, StandardCopyOption.REPLACE_EXISTING);} catch (IOException e) {e.printStackTrace();}}public static void main(String[] args) {String sourceFilePath = "D:\\100w\\source\\1111111111111.HDF"; // 替换为实际的源文件路径String destinationFolderPath = "D:\\100w\\dest"; // 替换为实际的目标文件夹路径int numFiles = 1000000; // 需要创建的文件数量int numThreads = Runtime.getRuntime().availableProcessors(); // 使用可用的处理器核心数作为线程数ExecutorService executorService = Executors.newFixedThreadPool(numThreads);try {// 创建目标文件夹（如果不存在）Files.createDirectories(Paths.get(destinationFolderPath));// 循环提交文件创建任务给线程池for (int i = 100; i < numFiles; i++) {int fileNumber = i;executorService.submit(() -> createFile(sourceFilePath,destinationFolderPath, fileNumber));}executorService.shutdown();} catch (IOException e) {e.printStackTrace();}//        try {//            // 获取源文件的路径对象//            Path sourcePath = Paths.get(sourceFilePath);////            // 创建目标文件夹（如果不存在）//            Files.createDirectories(Paths.get(destinationFolderPath));////            // 循环复制文件并创建副本文件//            for (int i = 0; i < numFiles; i++) {//                // 构造目标文件的路径对象//                String destinationFileName = "copy_" + i + "_" + sourcePath.getFileName();//                Path destinationPath = Paths.get(destinationFolderPath, destinationFileName);////                // 复制源文件到目标文件//                Files.copy(sourcePath, destinationPath, StandardCopyOption.REPLACE_EXISTING);//            }////            System.out.println("文件复制完成！");//        } catch (IOException e) {//            e.printStackTrace();//        }}